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[szx]

I set up a Virtual Server for port 55555 but I still cannot connect to it from the outside and nmap says it's closed (firmware version is 1.0.50). I've had this problem a while ago with an HTTP server as well. Why is it not working?

[FurryNutz]

Is the port being used when you go to test to see if it's open? The port needs to be used and activity going through it to test to see if it's open or closed. Ports are closed by default until something accesses it.

[szx]

Well, I'm running a script listening to the port through a TCP socket

[FurryNutz]

Try using something like this and see if it helps:
http://forums.dlink.com/index.php?topic=51194.msg191072#msg191072

You may want to phone contact level 2 or higher support at DLink.

[Grem]

szx,
please check your port with other software like uTorrent (set port for incoming connections or webui).
Make sure that your PC firewall is configured properly.

[szx]

please check your port with other software like uTorrent (set port for incoming connections or webui).

uTorrent didn't work either 

Make sure that your PC firewall is configured properly.

I'm not running a firewall unless Ubuntu has some sort of firewall installed by default (does it?)

[Grem]

uTorrent didn't work either 

So you can`t forward any port for any torrent client manual or by UPnP(should be enabled on the router+torrent_client)?

I'm not running a firewall unless Ubuntu has some sort of firewall installed by default (does it?)

iptables, ufw

Router Virtual Server

Code: [Select]

Name: Any
For all ports: 55555
Protocol: TCP
Server IP("Private IP"):  ubuntu_ip

Ubuntu
Run script and check port

Code: [Select]

sudo netstat -ntlp | grep :55555
Btw, your external address is not private(gray)?
Your IP and external Router IP should be the same.

Is your web interface looks like this?
http://ftp.dlink.ru/pub/ADSL/DSL-2500U/Description/docs%20for%20new%20fw%201.0.50/DSL-2500UD4_User%20Manual_v.1.0.50_26.06.12_EN.pdf